Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9bd7d0dec2f8ac…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 04:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdadf7742fe3ecaf9a589987515ade60 SHA-1: 70031b700216b87153eb90dd6849559a30c70e3c SHA-256: cf9bd7d0dec2f8acc801856a7d3b4838cda2bd93399b62497231def2bfb39ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose seems to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=ejercicios+movimiento+circular+uniformemente+acelerado+4+eso+pdf PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5eabe744580c56d702d14ba2ed36818b/gosimerivujumemevevuga.pdfIn PDF document text
    • https://arerp.kr/data/file///zeberugobotajibalexelum.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/923dede3ae6b494748f1ad19a6481072/dakojibapaluburonomikewo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7322e178b9---93576703136.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8cf07063d5ba1927826a5a167a093393/rozozotijaluzamuvisida.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ae249e922f1f8622aa2c840f1d35c475/jitetususubovuvenolun.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210814003218.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/pabarenudu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a09c504e745217eb03352406a0af9f0f/29362464528.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/tukawaxatemibiranudovax.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/pejimezasemudog.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/5577936987.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/jetebozawavuwu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/47f3dea1565828315daedc1d763fd3fc/pogoliwelajoxusof.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b3876f2c26441b86766a8e00939398ff/9845078704.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/dazuvumotaliji.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad624adbf79---ragofajutexedeta.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/70188595545.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cfc87a221---koluf.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f8ea338a---gitel.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/gisiwurunavesumiz.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/kawodakifutugavupepu.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/lewujusoxigomudumiwadugu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 21656 bytes
SHA-256: 1d2723325333023a665cd6fc49a8130f5999ade1fbf432856356642b10e50f06
font_02_sfnt_off00015616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15616 11136 bytes
SHA-256: 78cd11aaf34ec049ee8a0f28d9fdf0e98e7a74f6c93dfe98d765a8ef324b2d1f

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